裂解汽油加氢装置加热炉火焰不规则引起炉管过热的处理方法可能是()。
A、降低烧嘴燃料气阀前压力
B、提高烧嘴燃料气阀前压力
C、开大风门开度,增加燃烧空气
D、燃料气脱液
参考答案:C
—Look, the paint is starting to come off ____ the wall is damp.
—Well, we'd better have the wall repainted some day.[ ]
A. when
B. where
C. if
D. once
二氧化碳的防护措施?